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Investment in CyrusOne (Tables)
 12 Months Ended
Dec. 31, 2016
Related Party Revenues and Expenses [Member]  
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
Revenues and operating costs and expenses from transactions with CyrusOne were as follows:
 
 
Year Ended December 31,
(dollars in millions)
 
2016
 
2015
 
2014
Revenue:
 
 
 
 
 
 
Services provided to CyrusOne
 
$
1.2

 
$
1.3

 
$
1.7

 
 
 
 
 
 
 
Operating costs and expenses:
 
 
 
 
 
 
Charges for services provided by CyrusOne
 
$
10.2

 
$
10.2

 
$
9.1

Administrative services provided to CyrusOne
 
(0.3
)
 
(0.4
)
 
(0.5
)
Total operating costs and expenses
 
$
9.9

 
$
9.8


$
8.6
Related Party Receivables and Payables [Member]  
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
Amounts receivable from and payable to CyrusOne were as follows:
(dollars in millions)
 
December 31, 2016
 
December 31, 2015
Accounts receivable
 
$
—

 
$
0.1

Dividends receivable
 
1.1

 
2.1

Receivable from CyrusOne
 
$
1.1

 
$
2.2

 
 
 
 
 
Payable to CyrusOne
 
$
0.9

 
$
1.5